Frustrated by PSP-290!!!

Hi all,

I just bough PSP-290 (togheter with Go!Explore)
but up to now I was not able to make it working
with my PSP. The receiver is not seen at all
by my PSP.

I've a fat PSP, Motherboard TA 79-81 (as seen by Keycleaner v 1.4), Custom firmware: 5.00 M33-6.
I serached in the various formus and it seems that
several people fixed this problem using keyCleaner
by fixing one specific key (#41). To me, the
program says "Congratulations, your key appear to be fine", i.e. nothing strange!
I reformatted the Memory Stick, nothing.

- I tried the PSP-290-TEST by deniska but it fails telling something like "usb bus error" and it exits.
- GO!Explore tells me "please insert GPS receiver"
- MapThis 0.5.2 shows "GPS state OFF" even if I
activate the PSP-290 flag in the configuration file.

It is worth saying that my USB port is fine, i.e. I can exchange data with my PC.

Any help to a (very) frustrated PSP-290 user ?
Anyone had similar problems?

I have a psp with 5.00 m33-6 CFW I unpacked mapthis and loaded it into the files (GAME, GAME150, and GAME5XX) and the same thing always happens the program starts on the psp but after a couple of seconds it freezes and shuts down. WHAT CAN I DO? I need some help please. also my board is a TA-85. My project can't be completed without this .